Is there any reason that anyone thinks the 430n (or 730n) can display album art??
They display photos from the HDD but I have not seen any documentation that claims it sholuld display album art.

There are numerous references to album art in the documentation and marketing copy for the 430n, and in fact this feature works as advertised when you import music from a CD via the optical drive in the head unit. We're just having trouble getting it to work on other methods of importing. But we've got our best minds working on it.